Hi All,

Replacing heads on a 87 Blazer.

The problem was no compression on one cylinder. (#5)

Pulled the head.. Bent valve. 50k miles on crate motor. Driver was tootling down the freeway, long distance, and it started missing badly at about the halfway point.

Springs are fine.. It's the rotator equipped exhaust valve.

WHY???


Putting on a set of newly rebuilt GM heads as apposed to Mexican Heads(Crate motor origin).


Okay putting the new heads on. My usually very sharp mech buddy thinks that the new deal on valve adjustment is:

1) Bolt(torque) down heads.

2) Install push-rods and rockers.

3) Tighten down rockers until the play is gone then go 3/4 turn more. (ALL with the engine just static!) I think he's crazy! I can only imagine doing it with the engine running as; A) Valves that are not supposed to be closed will be left horribly loose as soon as Mr.Camshaft rotates to an open position. B) The lifters may have no oil in them and be bottomed as soon as the lash is gone during this static madness.

Am I correct?

Lastly, what 'is' the adjustment on this thing? Zero lash plus 3/4? or Zero plus 1?? Or ???

Thanks all, for your help.